Questions tagged [limit]
Limiting the usage of a resource (memory, disk space, CPU time, open files, network bandwidth, …) by a process or a group of processes.
219
questions
1
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1answer
20 views
Not able to increase ulimit -Hn, only shows up for a sudo su session
So I am trying to change my hard limit for file descriptors on Ubuntu18.04 laptop. I have tried everything but the changes have still not taken effect.
I need to run a go program which keeps throwing ...
0
votes
1answer
14 views
Unable to login to a user(oracle) “error: resource temporary unavailable”
When I try to login to oracle via ssh or su - oracle it shows following error
**error:resource temporary unavailable**
CPU Memory & IOps utilization is normal
0
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0answers
31 views
How can df report different information depending in it's target path?
Example:
root@myinstance:/my/instance/path# df -h
Filesystem Size Used Avail Use% Mounted on
...
/dev/mapper/hdd-place 13T 899G 12T 8% /run/iss
...
root@myinstance:/my/instance/...
0
votes
0answers
39 views
Limit outgoing tcp syn packets
I want to rate limit outgoing TCP SYN packets to prevent syn floods from local virtual private server customers.
Since the virtual private servers use the macvtap driver I cannot use iptables. I have ...
0
votes
2answers
91 views
“Xorg” process does not take limits from /etc/security/limits.conf
I have this in my /etc/security/limits.conf:
#<domain> <type> <item> <value>
root - memlock 65536
root - stack 524288
root ...
0
votes
0answers
23 views
limits.conf nproc not being applied
this is our limits.conf
* soft nofile 999999
* hard nofile 999999
* soft noproc 256000
* hard noproc 256000
and then we check for the changes after a reboot, ...
3
votes
0answers
68 views
How to “soft-limit” CPU usage of a process
I have some processes running on Debian that I want to limit cpu of it usage in the "soft" manner. For example, if it eats more than 70% of a single core for more than 15 minutes, the CPU should be ...
0
votes
1answer
42 views
limits.conf is not working
I'm trying to set default niceness/priority for a user's processes on Ubuntu 18.04.3 LTS in limits.conf and everything I write in limits.conf is simply ignored. Hard nice, soft nice, hard priority, ...
3
votes
0answers
87 views
Processes started through SSH add up to limit of SSH Daemon (systemd)
on a productive server there are (background) processes started by users which connect through SSH and run some scripts. These processes are daemons and keep on running. Each started process is found ...
1
vote
1answer
69 views
apache2 limits prefork
mb someone could give me some recommendation what limits should i use?
I have problem with webservice in centos7-cloudlinux Cpanel server, Apache2.4.
When server have high traffic in apache2 error ...
3
votes
1answer
29 views
Is it possible to impose a minimum niceness on a specific user?
Is it possible to limit a specific user's processes to always run with a niceness of at least 15, say?
2
votes
1answer
868 views
Limit bandwidth on a specific port in CentOS 7?
I am running CentOS 7 on my VPS and I would like to limit bandwidth on a specific port. I have looked around extensively, and out of the solutions I can find, either it's a limit placed on an ...
0
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0answers
118 views
Restricted shell within docker container
Some context for my question: I am working on a pty NodeJS server running in docker where I want to provide users connecting to the shell an isolated environment where they can play around with ...
1
vote
0answers
210 views
Limit container resources both using --memory and --cgroup-parent
I'd like to limit both total memory consumption for a group of containers as well as memory consumption for a particular container.
Say, a container is allowed to consume not greater than 1Gb and all ...
0
votes
1answer
24 views
Setting soft limit above hard does not fail in terms of exit code?
root@Andromeda:/# ulimit -n -S
2048
root@Andromeda:/# ulimit -n -H
2048
root@Andromeda:/# ulimit -n -S 4096
2048
root@Andromeda:/# echo $?
0
Failure to set soft limit above the hard one makes sense.
...
5
votes
1answer
137 views
dash maximum variable length under systemd
I have a shell script that uses a single variable as an associative array (one KEY=VALUE per line).
Throughout the execution of the script, the variable is manipulated to add, remove or modify ...
1
vote
1answer
71 views
Change max line length of GNU parallel
The following command:
parallel --max-line-length-allowed
returns 131049.
Is this a constant, or can I somehow change this limit?
1
vote
1answer
173 views
Limit on continuously writing to a log file
I am using Debian running on a BeableBone Black with 4GB of internal flash storage.
My program is continuously writing / appending to a log file that I created with >> every minute, all day ...
0
votes
1answer
703 views
Open file limits not increased for redis user despite change in /etc/security/limits.conf
I got
ERR max number of clients reached
from my redis server so I decidied to increase the allowed max client connections in its configuration. This also requires according to the documentation, ...
0
votes
1answer
880 views
Download error with youtube-dl and axel
I am trying to download following video:
https://www.youtube.com/watch?v=pQWj2Fgxdrc
by combining 'youtube-dl' and 'axel'. I am trying to download this video in such a way that I want these two ...
0
votes
0answers
53 views
Limit TCP connections per second for different IP addresses [attacked with 1000 connections with different IP] [duplicate]
How to limit TCP connections per second for different IP addresses? I'm looking for limit per second for different IP's on 25565 port.
Limit max connections per IP address and new connections per ...
7
votes
1answer
3k views
How to limit a systemd service to “play nice” with the CPU?
I have a systemd service (a CI runner) that tends to bog the system down with very CPU intensive jobs. I caught the load average flying over 100 just now and want to put a stop to that nonsense.
...
2
votes
0answers
240 views
Restart a process if cpu usage is more than 90% for more than a 60sec
Normally one of my systemd services will take about 0...5% cpu Usage. In some cases it can reach up to 100% but only for some seconds. If the Service "crashes" it takes up to 100% continuously.
So I ...
1
vote
0answers
15 views
Launch a program to only specific resources
Question:
How can I launch a program such that it only uses X ram and Y CPU cores, etc? I happen to be using Ubuntu in this case, but since I often am on other distros, I need a general GNU/Linux ...
1
vote
0answers
283 views
What is the maximum open files limit?
I'm working on a reasonably large project, and recently had to bump the nofile setting above 500,000. I tried to change it to five million in /etc/security/limits.d/99-users-nofile.conf, but ...
9
votes
1answer
36k views
max no of tcp connections on a linux system
I know that /etc/security/limits.conf provides the persistent soft and hard limits for several values.
However, in the relevant list there is no indication about imposed limits on:
a) concurrent ...
0
votes
1answer
591 views
cgroups: Is it possible to limit cpu usage by process name instead of by pid
As we know, cgroups can limit cpu usage of processes. Here is an example:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
30142 root 20 0 104m 2520 1024 R 99.7 ...
1
vote
2answers
345 views
Preventing un tar from using too much CPU
I am running un tar i.e tar xzvf abc.tar.gz on Beaglebone green. This seems to be using too much CPU. When a untar operation is in progress, i see via top command the CPU usage.. not sure why it seems ...
0
votes
1answer
189 views
Is there a way to restrict the application access to the system time in linux?
Is there a way to restrict the application access to the system time in linux?
I want to make the application launch as much as possible abstracted from the environment. If you can restrict access to ...
3
votes
1answer
5k views
ulimit vs file-max
Could someone explain limit on open files in linux? The problem is that one of my applications if reporting "Too many open files".
I have
ulimit -n
1024
but
cat /proc/sys/fs/file-max
6578523
and
...
1
vote
0answers
231 views
Where does a bash process get its default signal handlers/traps?
From https://stackoverflow.com/questions/50606753/do-getrlimit-and-setrlimit-work-by-reading-from-and-writing-to-etc-sec#comment88227414_50607042
Bash doesn't have a special handler for SIGQUIT ...
0
votes
1answer
516 views
Limiting RAM for a group of users on Ubuntu Machine
I have a gpu based system. Multiple users use the system, as a result, the RAM frequently gets fully utilized leaving no memory for myself. I want to put a maximum RAM limit on all the users except ...
0
votes
0answers
392 views
Limit directory size in a Docker container
I have a web application in a Docker container. I need to limit maximum size of some of its directories. When I was not using Docker, I just created disk partitions of the limit size and put those ...
2
votes
0answers
560 views
scp : -l option (bandwidth limiting) doesn't work when scp-ing from a remote server to another remote server
If I do :
$ scp -l 1024 remote1:/path/to/file remote2:/path/to/destination
I can see, using nload on remote1, that the bandwidth used by scp isn't limited to 1024 kbits/s like I thought.
I found a ...
2
votes
0answers
98 views
Using a large number of nullfs mounts to create a virtual FS on FreeBSD - what are the practical limits + impacts?
I have a situation where I'm possibly going to create a virtual file system on FreeBSD, comprised entirely of nullfs mounts of selected "ordinary" dirs within my various ZFS datasets (and their ...
2
votes
2answers
3k views
How to limit the number of open files for nfsd with systemd
It's fairly straightforward to control open file limits for many services with systemd: You create a file at /etc/systemd/system/$service_name.service.d/limits.conf, add a [Service] section with ...
2
votes
0answers
208 views
How to check usage of mqueues reliably?
I run a testing server for software that depends on the massive usage of mqueues (POSIX messages queues). I increased limits to a reasonable level and got it working a long time ago. However, the ...
1
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0answers
196 views
How to check the shell of a running process?
I am working on Solaris 11 zone and I need to check which shell a running process is using. I have the PID but I am not sure where to get the information from.
I have a scenario where some resource ...
2
votes
3answers
10k views
Increasing open files limit for all processes: Do I need to set Soft/Hard limits?
I'm trying to fix the following error that I get after a day or two of running my game server.
2017/12/13 12:08:35 http: Accept error: accept tcp [::]:8081: accept4: too many open files; retrying in ...
2
votes
2answers
4k views
What is maximum number of files you can store in a tar archive under Solaris 11?
I need to store a large number of files (> 100,000) in a tar archive and have run into the error: /bin/sh: /bin/tar: cannot execute [Arg list too long].
Are there limits with UNIX Solaris tar or GNU ...
1
vote
0answers
217 views
how to let aufs use more than 127 layers? or an alternative to it
I came to the conclusion that aufs is limited to 127 layers based on tests.
(prepare)
mkdir write joined {1..400}
for((i=1;i<=400;i++));do echo >$i/$i.txt;done #for checks
using a single ...
0
votes
0answers
25 views
how to make a memory hungry application cause swap slowness only to itself? [duplicate]
I have 6GB RAM and 10GB swap. Some applications dare to consume/allocate/use about 5GB to 6GB of RAM.
When the memory completely fills out, the whole system hangs for 1 to 2 minutes to swap all ...
19
votes
3answers
3k views
Get over 2 GB limit creating PDFs with ImageMagick
I am using convert to create a PDF file from about 2,000 images:
convert 0001.miff 0002.miff ... 2000.miff -compress jpeg -quality 80 out.pdf
The process terminates reproducible when the output file ...
0
votes
1answer
1k views
RHEL setting a user specific max number of open files
I've set up below values in /etc/security/limits.conf in my RHEL machine.
* hard nofile 65535
@student hard nofile 100000
Is this the correct approach when setting a user specific max number of ...
1
vote
1answer
169 views
Truncate if necessary when moving file to filesystem with shorter NAME_MAX
I want to move veryverylongfilename.txt to a filesystem which has a short NAME_MAX.
mv veryverylongfilename.txt /mnt/tiny gives me an ENAMETOOLONG-type error:
mv: cannot stat '/mnt/tiny/...
3
votes
1answer
967 views
System wide environment variable gets truncated
On Ubuntu 16.10, I set a system wide environment variable in /etc/environment file. The variable is a string that has a length of thousands of characters (the string is a comma-separated list of small ...
2
votes
2answers
484 views
Max out file descriptors
I wish to write a script that will use up all of the available file descriptors on my Linux machine. I am unsure how exactly to do this, or if it is even possible? But I wish to use this script for a '...
3
votes
1answer
1k views
Do files opened by child processes count against the file open limit for the parent process?
On Mac or Linux if you use the command ulimit -n you can see the page open limit for what seems to be an individual process according to this stackoverflow post.
So if a parent process spawns child ...
20
votes
2answers
5k views
Why is socket path length limited to a hundred chars?
On Unix systems path names have usually virtually no length limitation (well, 4096 characters on Linux)... except for socket files paths which are limited to around 100 characters (107 characters on ...
0
votes
1answer
3k views
Ulimit values in limits.conf vs 20-nproc.conf
In a CentOS/RHEL machine, the limit of user processes can be defined in /etc/security/limits.conf as well as in /etc/security/limits.d/20-nproc.conf
What is the difference in those two values ...
